struts+mysql做的用户登录，有错误

Question

今晚搞了一个用户登录，没改正这个bug。求高手指正。
错误提示：
2013-4-30 22:12:53 org.apache.struts.util.RequestUtils createActionForm
警告: No FormBeanConfig found under 'managerForm'
java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:418)
at java.util.Properties.load0(Properties.java:337)
at java.util.Properties.load(Properties.java:325)
at com.core.ConnDB.<init>(ConnDB.java:19)
at com.dao.ManagerDAO.<init>(ManagerDAO.java:8)
at com.action.Manager.<init>(Manager.java:14)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.apache.struts.util.RequestUtils.applicationInstance(RequestUtils.java:143)
at org.apache.struts.action.RequestProcessor.processActionCreate(RequestProcessor.java:292)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:230)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
2013-4-30 22:12:54 org.apache.struts.action.RequestProcessor processException
警告: Unhandled Exception thrown: class java.lang.NullPointerException
2013-4-30 22:12:54 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.lang.NullPointerException
at com.action.Manager.managerLogin(Manager.java:34)
at com.action.Manager.execute(Manager.java:24)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:431)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:236)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
配置文件是这样：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd"><struts-config>
  <data-sources />
  <form-beans >
  <form-bean name="ManagerForm" type="com.actionForm.ManagerForm"/>
  </form-beans>
  <global-exceptions />
  <global-forwards />
  <action-mappings type="org.apache.struts.action.ActionMapping" >
    <action name="managerForm" path="/manager" scope="request" type="com.action.Manager" validate="true">
   <forward name="error" path="/error.jsp" />
   <forward name="managerLoginok" path="/Mindex.jsp"/>
   
   
  </action>
  </action-mappings>
  <message-resources parameter="com.yourcompany.struts.ApplicationResources" />
</struts-config>

Answer 1

空指针了。。
你断点看看at com.action.Manager.managerLogin(Manager.java:34) 这个类34行 哪个是null.

Answer 2

红色部分就是34行。。怎么改，为什么会 是空值呢// 管理员身份验证 public ActionForward managerLogin(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response) {
ManagerForm managerForm = (ManagerForm)form;
System.out.print("zheli1111");
managerForm.setU_name(managerForm.getU_name());
managerForm.setU_pwd(managerForm.getU_pwd());
int ret = managerDAO.checkManager(managerForm);
if (ret == 1) {
HttpSession session = request.getSession();
session.setAttribute("manager", managerForm.getU_name());
return mapping.findForward("managerLoginok");
} else {
request.setAttribute("error", "您输入的管理员名称或密码错误！");
return mapping.findForward("error");
}
}

Answer 3

 <form-bean name="ManagerForm" type="com.actionForm.ManagerForm"/><action name="managerForm" path="/manager" scope="request" type="com.action.Manager" validate="true"><form-bean> 的name和<action>的name配的不一样

Answer 4

警告: No FormBeanConfig found under 'managerForm'
java.lang.NullPointerException
at com.action.Manager.managerLogin(Manager.java:34)
应该是参数问题！

Answer 5

你的struts-config是自动生成的吗

Answer 6

应该是参数的问题，好好看name

Answer 7

是我自己写的，谢谢你了，我的bug昨晚搞好了，正如3#所说，就是配置的name写的不一致。

Answer 8

应该是参数的问题，好好看name对的，改过来就好了，。谢谢你